C0042-28

C0042-28-BRAKE PEDAL POSITION SENSOR - SIGNAL BIAS LEVEL OUT OF RANGE / ZERO ADJUSTMENT FAILURE

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Ignition on.

- Set Condition:
If Anti-lock Brake System (ABS) Module is sensing the latest learned brake off voltage has changed by an amount too great from the original calibrated voltage.





NOTE: If any other DTCs are present, repair them first before continuing with this diagnostic procedure.

1. VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read and record the DTCs.
3. With the scan tool, erase the DTCs.
4. Start the vehicle.
5. Apply the brake pedal several times.
6. With the scan tool, read the ABS DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION TEST. Testing and Inspection.

2. INSPECT THE BRAKE PEDAL POSITION (BPP) SENSOR FOR INCORRECT INSTALLATION, DAMAGE OR MECHANICAL FAILURE
1. Turn the ignition off.
2. Visually inspect the BPP Sensor for Improper installation, damage or mechanical failure. Stop Lamp Switch - Installation.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 3

3. BRAKE PEDAL POSITION (BPP) SENSOR NOT APPLIED VOLTAGE
1. Start the engine.
2. With the scan tool, under "Data Display" read the BPP voltage with brake pedal not pressed.
3. Press the brake pedal several times.
4. Lightly pull upward on the brake pedal.

Was the brake pedal not applied BPP voltage change greater than 0.3 volt?

Yes

- Go To 5

No

- Go To 4

4. INITIALIZE ANTI-LOCK BRAKES SYSTEM (ABS) MODULE
1. Turn the ignition on.

WARNING: To avoid possible serious or fatal injury, check brake capability is available before road testing.

2. Initialize the ABS Module, Perform the ABS VERIFICATION TEST. ABS Verification Test.

NOTE: The ABS Module Initialization process must include driving the vehicle into a 90° turn.

3. Park the vehicle.

Was the ABS Module initialization successful?

Yes

- Go To 5

No

- Perform the ABS Module Initialization routine again, if still unsuccessful.
- Replace the Anti-lock Brake System (ABS) Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

5. BRAKE PEDAL POSITION SENSOR
1. Turn the ignition off to the lock position.
2. Replace the Brake Pedal Position Sensor. Stop Lamp Switch - Removal.
3. Perform the ABS VERIFICATION TEST. ABS Verification Test.
4. Start the engine.
5. With the scan tool, under "Data Display" read the BPP voltage with brake pedal not pressed.
6. Press the brake pedal several times.
7. Lightly pull upward on the brake pedal.

Was the brake pedal not applied BPP voltage change greater than 0.3 volt?

Yes

- Replace the Brake Pedal Assembly. Brake and/or Accelerator Pedals - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.